Add native_mate implemented Event and EventEmitter.

atom/browser/api/event.h

@@ -0,0 +1,57 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_API_EVENT_H_
+#define ATOM_BROWSER_API_EVENT_H_
+
+#include "content/public/browser/web_contents_observer.h"
+#include "native_mate/wrappable.h"
+#include "native_mate/handle.h"
+
+namespace IPC {
+class Message;
+}
+
+namespace mate {
+
+class Event : public Wrappable,
+              public content::WebContentsObserver {
+ public:
+  static Handle<Event> Create(v8::Isolate* isolate);
+
+  // Pass the sender and message to be replied.
+  void SetSenderAndMessage(content::WebContents* sender, IPC::Message* message);
+
+  // event.PreventDefault().
+  void PreventDefault();
+
+  // event.sendReply(json), used for replying synchronous message.
+  bool SendReply(const string16& json);
+
+  // Whether event.preventDefault() is called.
+  bool prevent_default() const { return prevent_default_; }
+
+ protected:
+  Event();
+  virtual ~Event();
+
+  // Wrappable implementations:
+  virtual ObjectTemplateBuilder GetObjectTemplateBuilder(v8::Isolate* isolate);
+
+  // content::WebContentsObserver implementations:
+  virtual void WebContentsDestroyed(content::WebContents*) OVERRIDE;
+
+ private:
+  // Replyer for the synchronous messages.
+  content::WebContents* sender_;
+  IPC::Message* message_;
+
+  bool prevent_default_;
+
+  DISALLOW_COPY_AND_ASSIGN(Event);
+};
+
+}  // namespace mate
+
+#endif  // ATOM_BROWSER_API_EVENT_H_